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Canon EF lens mount
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The EF lens mount is the standard lens mount on Canon’s EOS family of cameras. EF stands for "Electro-Focus": automatic focusing on EF lenses is handled by a dedicated electric motor built into the le
The rear end of an EF mount lens with its electronic contacts visible
The rear end of an EF mount lens with its electronic contacts visible
The EF mount of a Canon EOS 50
The EF mount of a Canon EOS 50
Electronics of an EF-S lens
Electronics of an EF-S lens
An EF lens showing its different controls and features
An EF lens showing its different controls and features
Canon EF-S lens mount
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The Canon EF-S lens mount is a derivative of the EF lens mount created for some Canon digital single-lens reflex cameras with APS-C sized image sensors. It was released in 2003. Cameras with the EF-S
Canon EF lens mount
…EF mount lenses are somewhat compatible with newer Canon bodies, though the reverse is not true: EF-S lens mount cameras can mount EF lenses without an adapter EF-M lens mount cameras can mount EF lenses with an EF-EOS M adapter…
An example of a plastic EF-S lens mount.
An example of a plastic EF-S lens mount.
An EF-S compatible body, the Canon EOS 400D, with open lens mount
An EF-S compatible body, the Canon EOS 400D, with open lens mount
An EF-S compatible mount close-up, from the Canon 30D. Note the circular indent inside the mount, which corresponds to the raised ring on the lens.
An EF-S compatible mount close-up, from the Canon 30D. Note the circular indent inside the mount, which corresponds to the raised ring on the lens.
EF lens (left) and EF-S lens (right). Note raised ring on EF-S lens.
EF lens (left) and EF-S lens (right). Note raised ring on EF-S lens.